Rosenborg Castle, located in Copenhagen, is a stunning Renaissance castle housing the Danish Crown Jewels and royal collections. The castle generally offers good accessibility with elevators and ramps, but some areas may have limited access. A visit can be enjoyed solo or with a guided tour to delve deeper into its history. The castle is open year-round, though hours may vary seasonally; checking the official website is recommended. Expect to spend approximately 2-3 hours exploring the castle and its grounds. Admission costs around 120-130 DKK. It's conveniently located in the city center and easily reachable by public transportation.